Most anabolics wreck cardio (LISS) because the back pumps are ridiculous.

Had a buddy run low dose M-Sten (10mg) for a cut and it didn't bother him until he got a stomach bug and ended up getting dehydrated from it. Then he was sucking.

Precisely this...let alone that, Epi is notorious for drying out joints...if you can jog/run for more than 15 minutes without massive knee/ankle pain and back pumps, then you are a true pro at this game.